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SOME IMPORTANT CHARACTERISTICS OF NEW OIL WHEN TESTED AT THE MANUFACTURER'S WORKS SI. Characteristics No. (Ref. .- IS 335) 53 Test Method (Ref. lo IS or Appendix) (1) (2) (3) (4) 1. Appearance A representative sample in 100 mm thick layer 2. Electric strength (break down voltage) IS:6792-1972 Annexure. 3.03A Requirements The oil shall be clear and transparent, free from suspended matter or sediments a) New Unfiltered Oil Min. 30 kV (rms) b) After filtration If the above value is not attained, the oil shall be filtered. 50 kV (rms) 3. Resistivity at Min. (a) 90° C IS:6103-1971 35 x 10 12 Ohm-cm (b) 27° C 1500 x 10 12 Ohm-cm 4. Dielectric dissipation factor (tan delta) at 90° C 5. Water content Appendix E <strong>of</strong> IS:335-1983 IS:6262-1971 Max. 0.002 Max. 50 ppm 6. Interfacial tension at 27° C IS:6104-1971 Min. 0.04 N/m 7. Flash point IS:1448 Min, 140° C 8. Dissolved gas content 4-8% 9. Neutralization value IS: 1448 a) Total acidity Max. 0.03 mg KOH/g b) Inorganic acidity/alkalinity - do - Nil
SI. No . APPLICATION AND INTERPRETATION OF TESTS ON TRANSFORMER OIL IN SERVICE (Ref.: IS : 1866) Tests Value as per IS: 1866 Permissible limits 54 To be re-conditioned Annexure 3.03B To be replaced 1 2 3 4 5 1 Electric Strength (Breakdown voltage) Below 72.5 kV 30 kV 72.5 kV and less than 145 kV Min Less than the value specified in Column 3 40 kV 145 kV.and above 50 kV 2 Specific resistance (Resistivity) Ohm/cm at 27 °C above 10 x l0 12 Between 1 x l0 12 to 10 x 10 12 3 Water content Greater than the value, specified in Column 3 Below 145 kV Max 35 ppm Above 145 kV 25 ppm 4 Dielectric dissipation factor, Tan delta at 90° C 5 Neutralization value mg KOH/g <strong>of</strong> all 6 Interfacial tension N/m at 27°C. Below 1 x 10 12 0.01 or less Above 0.1 to 0.1 Above 0.01 0.5 or less Above 0.5 Above 1.0 0.02 or more 0.015 and above but below 0.02 7 Rash point In °C 140 or more 125 and above but below 140 Below 0.015 Below 125 8 Sludge Non-detectable Sediment Perceptible Sludge 9 Dissolved Gas Analysis (DGA) Refer Annex. 2.04
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PREFACE The book on "Power Supply I
Page 5 and 6: However transformers of capacity 13
Page 7 and 8: 3. To keep the unbalance on the 3 p
Page 9 and 10: 1.2 POWER SUPPLY FOR SIGNALLING 1.2
Page 11 and 12: locomotives and Electric Multiple U
Page 13 and 14: 2.0 Supply System 2. POWER SUPPLY F
Page 15 and 16: figures. This charge should be real
Page 17 and 18: 2.4 Scrutiny of Bills have a bearin
Page 19 and 20: c) Procedure to be followed in case
Page 21 and 22: In the territorial setup one Subord
Page 23 and 24: 3.2.3 Over load Capacity of Tractio
Page 25 and 26: B. Insulation resistance will conti
Page 27 and 28: 3.3. GUIDING NOTES ON MAINTENANCE 3
Page 29 and 30: f) Fully push home the wedges betwe
Page 31 and 32: eakers/interrupters should also be
Page 33 and 34: A detail history of every battery s
Page 35 and 36: light or bluish grey according to a
Page 37 and 38: (e) Overhaul, bench tests and calib
Page 39 and 40: 3.5. FORTNIGHTLY MAINTENANCE 3.5.1.
Page 41 and 42: obstruction and also if the shock a
Page 43 and 44: 2. Test a sample of oil for BDV. 3.
Page 45 and 46: 3. Check if the terminations of the
Page 47 and 48: Fortnightly Schedule: a) Drain wate
Page 49 and 50: d) Measure the IR between auxiliary
Page 51 and 52: TRACTION DISTRIBUTION SCHEDULE OF M
Page 53 and 54: 3.0 Inspection of Traction Sub-stat
Page 55: 4.0 Switching Stations a) Switch Ya
Page 59 and 60: 2.2 Oxidation Carbondioxide is the
Page 61 and 62: 3.4 Pattern of generation of gases
Page 63 and 64: TABLE - I SOLUBILITY OF DIFFERENT G
Page 65 and 66: TABLE V ROGER'S METHOD OF DIAGNOSIS
Page 67 and 68: 1.1 Schedules MAINTENANCE OF SF6 CI
Page 69 and 70: Point / Location Tripping Mechanism
Page 71 and 72: 1.0 General Annexure 3.05 MAINTENAC
Page 73 and 74: 1.5 Detailed Check Checking shall b
Page 75 and 76: DESIGN ASPECTS OF TRACTION SUBSTATI
Page 77 and 78: • Characteristics of the locomoti
Page 79 and 80: considerations enlisted in para 4.0
Page 81 and 82: xii) Load losses 135.0 kW xiii) Cur
Page 83 and 84: item Nominal System Voltage 66kV 11
Page 85 and 86: 20 1250 1600 2000 245 31.5 1250 160
Page 87 and 88: i) Three post, centre post rotating
Page 89 and 90: etween live parts and different pot
Page 91 and 92: 4.11.5 Design of grounding system 4
Page 93 and 94: 4.12.2 BIL of various equipments us
Page 95 and 96: (d) High speed inter tripping relay
Page 97 and 98: The relay continuously monitors the
Page 99 and 100: SULFUR HEXAFLUORIDE(SF6) GAS 96 ANN
Page 101 and 102: 5.0 POWER SUPPLY SYSTEM PROTECTION
Page 103 and 104: any one of the two sub-staion throu
Page 105 and 106: fault relay (132KV&25KV side) 4. ID
Page 107 and 108:
will be supplied to the successful
Page 109 and 110:
detected by normal distance protect
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108
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110
Page 115 and 116:
112
Page 117 and 118:
114
Page 119 and 120:
116
Page 121 and 122:
118
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120
Page 125 and 126:
Just as the requirements of supervi
Page 127 and 128:
The use of hermetically sealed comp
Page 129 and 130:
The configuration used in Railway S
Page 131 and 132:
This may be accomplished by several
Page 133 and 134:
A typical example of commonly used
Page 135 and 136:
7.2.6.2The above sequence of messag
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7.3 SCADA EQUIPMENT 7.3.1 General T
Page 139 and 140:
7.3.10 SCADA Software The operating
Page 141 and 142:
systems are different, the basic fe
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140
Page 145 and 146:
To combat interference, co-ordinate
Page 147 and 148:
e = Er / R were introduced in the v
Page 149 and 150:
It is seen that even if the lines a
Page 151 and 152:
Fig. 8.3 Fig. 8.3 contains a family
Page 153 and 154:
Typical Rail Current Distribution F
Page 155 and 156:
8.8 SUPPRESSION OF INTERFERENCE AT
Page 157 and 158:
Magnetizing current is required to
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REGULATION FOR ELECTRICAL CROSSING
Page 161 and 162:
Kc is cable screening factor and it
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